http://news.scotsman.com/latest.cfm?id=4156114
"Sub-atomic particles created by cosmic rays from space are to be used to probe a giant Mexican pyramid and solve one of the world’s greatest archaeological mysteries.
Investigators are to install detectors beneath the Pyramid of the Sun that look for muons – charged particles generated when cosmic rays hit the atmosphere which continuously shower the Earth.
They hope the rate at which muons pass through the pyramid will reveal any hidden burial chambers inside."
I don't think WAHa will approve of this one.
No, this one is pretty cool. I've seem similar ideas in the news recently to detect heavy elements - read, nuclear explosives - in freight containers. Supposedly the nucleus-muon scattering is heavily dependent on the atomic number of the nucleus, and muons penetrate materials very efficiently, so they pass through lead shielding, and you can supposedly discern the elements they scattered from well enough to differentiate between heavy fissionable elements, and lighter harmless ones.
I'm not sure about how exactly you'd set up a muon scattering measurement around a whole pyramid, and how you'd get any useful data out of it, but luckily that's not my problem. I'm sure the people working on it have have their work cut out for them there.